Polymers with Pendant Furan Groups

Tsuda [160] attached 2-furylacrolein to a polymeric backbone by the following reaction:

In the presence of photosensitizers, this polymer was found by Tsuda to cross-link at a considerably faster rate than does poly (vinyl cinnamate) [160]. He showed that the cross-linking reaction also results in formation of cyclobutane derivatives. The cross-linking is illustrated on 3-furfurylacrylic ester:

Tajima, Arai, and Takeuchi [161–163] studied the effects of singlet oxygen on photocross-linking of poly (furfuryl methacrylate). The singlet oxygen was generated by fullerene C60. The reactions were carried out in 1,1,2,2-tetra-chloroethane solutions that contained the polymer and fullerene C60. Gelation occurs when exposed to visible light in the presence of photosensitizers. These solutions gel after several hours and subsequently solidify completely [163]. It is interesting to note that fullerines are also effective in causing sensitization of poly (furfuryl methacrylate) and are effective in causing cross-linking upon with UV irradiation [164]. This is attributed to their long-lasting ability to sensitize oxygen even when they themselves undergo oxidation The sensitivity of poly (furfuryl methacrylate) increases linearly when the concentration of C₆₀ is increased from 5 x 10^-5 to I x 10^-3 mol/L. Saturation of sensitivity in the high C60 concentration regions was observed to be due to deficiency of oxygen molecules in the resist films. It was concluded that the dissolution rate of oxygen from the atmosphere into the resist film is lower than its consumption rate [164]. Preparation of photocross-linkable furan-containing polyimides was also reported [165]. It was also found that the polymer cross-links with the aid of singlet oxygen. Formations of fine pattern images can be formed. This was taken as clear evidence of the successful photolithography in this photo-curable system that uses C60 as the photosensitizer [165].

اخر الاخبار

اخبار العتبة العباسية المقدسة

قسم شؤون المعارف يصدر العدد 35 من مجلة الخطوة

بالتزامن مع حلول أولى ليالي القدر المباركة شعبة التوجيه الديني النسوي تنظم البرنامج التفاعلي أروقة رمضانية للزائرات

ضمن برنامج يبلغون.. المجمع العلمي ينظم 8 مجالس قرآنية رمضانية في محافظة البصرة

​استعدادًا لليالي القدر.. قسم الشؤون الخدمية يستنفر جهوده في تنظيف محيط مرقد أبي الفضل العباس (عليه السلام) وغسله

المزيد

الآخبار الصحية

مركب طبيعي في القهوة يحمينا من التهابات اللثة

داء السكري لا يرفع السكر فقط.. بل يزيد خطر الإصابة بأمراض القلب!

اكتشاف سبب غير متوقع لضعف الذاكرة والتركيز

نصائح علمية لتقوية دماغك وتقليل التدهور العقلي

المزيد

الآخبار التكنلوجية

باحثون يرصدون أثر تغيّر المناخ في دم البشر

الجميع يحلم.. لماذا يتذكر البعض أحلامهم بينما ينسى آخرون؟

حرق الأمونيا.. كيف يساعد محطات الكهرباء في اليابان على إزالة الكربون؟

الشمس تقذف نتوءا عملاقا باتجاه قطبها الشمالي

المزيد

مواضيع ذات صلة

Changes in Viscosity and Solubility of Polymeric Solutions

Photo-Isomerization of the Azo Group

Photo-Isomerization of the Olefinic Group

Copolymers of Methacrylates with Cholesteric Monomers

Polymers with Norbornadiene Moieties

Photo-Responsive Polymers

Polymers Designed to Cross-link Upon Irradiation with Laser Beams

Polymers with Pendant Azide Groups

Polymers with Pendant Abietate and Dibenzazepine Groups

Polymers with Pendant Maleimide Groups

Polymers with Functional Groups Similar to Cinnamates

Polymers with Functional Chalcone Groups